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When your drivetrain needs to change direction without losing torque, a mismatched or imprecise bevel gear set becomes the weakest link in your build. Whether you are designing a CNC axis, a robotic joint, or a custom mechanical assembly, these 1.5 modulus metal umbrella bevel gears give you a matched 20T/40T pair engineered to mesh at exactly 90° with a 1:2 speed ratio — so your motion stays smooth and your tolerances stay tight.
Each gear is machined from metal alloy (typically carbon steel or alloy steel) with a 1.5 modulus tooth profile. The 20-tooth pinion and 40-tooth wheel are available as individual selections from a matched pairing set. Bore sizes range from 8 mm (0.31 in) to 20 mm (0.79 in), with optional keyway cuts of 4×1.8 mm, 5×2.3 mm, or 6×2.8 mm to suit standard shaft-key configurations. Outer diameter varies by tooth count — typically 33 mm (1.30 in) for the 20T gear and 63 mm (2.48 in) for the 40T gear.
These bevel gears are well suited for DIY gearbox builds requiring a 2:1 reduction, robotics arm joints where a 90° direction change is needed, CNC router Z-axis or rotary axis drives, and small automation prototypes where a compact right-angle drive is required.
Sold as individually selectable gears from a pre-matched set engineered to mesh together at a 1:2 ratio, eliminating the guesswork of sourcing compatible gears separately.
The umbrella bevel tooth geometry delivers a true 90° power transmission axis, ideal for right-angle gearbox designs and direction-change drivetrains.
Available in 11 bore sizes from 8 mm to 20 mm to fit a broad range of metric shafts used in robotics, automation, and DIY mechanical projects.
Choose from No Keyway, 4×1.8 mm, 5×2.3 mm, or 6×2.8 mm keyway cuts to match your shaft-key standard and ensure positive torque transmission without slippage.
Machined from carbon or alloy steel with consistent tooth geometry across the full face width, providing reliable load-bearing capacity for continuous-duty applications.
The 1.5 modulus standard ensures interchangeability with other 1.5M bevel gear components and predictable contact ratios for smooth, low-noise operation.
| Modulus | 1.5 |
|---|---|
| Tooth Numbers (Pairing Set) | 20T (pinion) + 40T (wheel) |
| Mesh Angle | 90° |
| Speed Ratio | 1:2 |
| Bore Diameter Range | 8 mm – 20 mm (0.31 in – 0.79 in) |
| Keyway Options | No Keyway / 4×1.8 mm / 5×2.3 mm / 6×2.8 mm |
| Outer Diameter (20T) | Typically ~33 mm (1.30 in) |
| Outer Diameter (40T) | Typically ~63 mm (2.48 in) |
| Material | Carbon steel / alloy steel |
| Tooth Profile Standard | 1.5 Modulus bevel (umbrella type) |
| Quantity per Order | 1 Pc (single gear per variant) |
| Surface Finish | See variant options |
Each listing variant represents a single gear. To build a complete 90° 1:2 bevel gear set, you need to select and purchase both the 20T pinion and the 40T wheel. Make sure both gears share the same modulus (1.5) and that your bore sizes match your shaft diameters.
Measure your shaft diameter with a caliper and select the matching bore size from the dropdown. Available bores are 8, 10, 12, 12.7, 14, 15, 16, 17, 18, 19, and 20 mm. If your shaft is imperial (e.g., 1/2 in = 12.7 mm), the 12.7 mm bore option is available for a direct fit.
Keyway dimensions follow standard shaft-key fits. As a general guide: 4×1.8 mm keyways suit shafts in the 10–12 mm range, 5×2.3 mm suits 14–15 mm shafts, and 6×2.8 mm suits 16–20 mm shafts. If your shaft has no keyway slot, select No Keyway and secure the gear with a set screw or interference fit.
These gears are machined from metal alloy and are suitable for moderate-duty applications such as robotics, CNC auxiliary axes, and DIY gearboxes. Exact load ratings depend on operating speed, lubrication, and shaft alignment. For heavy industrial loads or continuous high-torque applications, confirm your torque requirements against the gear face width and material grade before ordering.
The base material is carbon or alloy steel, which offers good mechanical strength but moderate corrosion resistance. For environments with moisture or mild chemicals, apply a light machine oil or grease to the tooth faces and bore. For highly corrosive environments, consider stainless steel alternatives or apply a protective coating after installation.
Yes — as long as the mating gear shares the same 1.5 modulus and is designed for a 90° mesh angle, these gears will be geometrically compatible. Always verify the pressure angle (typically 20°) matches between mating gears to ensure correct tooth contact and avoid premature wear.
Yes. You can purchase either gear individually by selecting the tooth number and bore size from the variant options. This is useful if you need a replacement for a worn gear in an existing assembly, or if you are building a custom ratio using a different mating gear.
